I haven't encountered too much (aside from the financial ones), but my mom had quite a lot of interesting encounters... So, my dad is an atheist but was raised Christian, and a lot of his family was ignorant, to say the least.

My dad's dad apparently told my mom that he'd heard that Jewish men cheat on their wives, and asked if this was true. My mom naturally told him that she'd only heard that about Christian men.

My dad's mom's family wasn't so antisemitic, but was quite rural. Apparently his mom's mom told my mom that she reminded her of the "Vietnamese boat people", and that she quite liked her. My mom was naturally incredibly confused by this until she realized that Vietnamese refugees were the only people my great-grandma had met who weren't white and Christian.

I once heard Jews compared to cheap taskmasters, demonstrated through Christopher Columbus.

Context: I was in fourth grade, an we were reading some book about life on Columbus' ships from the point of view of a child. We're discussing Columbus and how he treated his crew, when some kid in class yelps out "He must have been Jewish." My teacher freaked out, sent him to the principal, and pulled me aside after class with the other Jewish students (public school) to make sure we were OK. This was when I learned that ignorance and intolerance are learned attributes, and now I pity close-minded, ignorant adults because they were brought up that way and never had a chance.